摘要
汽液平衡数据对于共沸物分离具有十分重要的地位,为了解决乙酸+异丙醇酯化反应体系中的共沸物分离的问题,采用Dvorak-Boublik平衡釜测定了乙酸+异丙醇+乙酸异丙酯、乙酸+异丙醇+水、乙酸+乙酸异丙酯+水、异丙醇+乙酸异丙酯+水4个三元体系的汽液平衡数据,对实验数据进行热力学一致性检验和NRTL(nonrandomtwo-liquid)模型关联。通过残留曲线图分析了共沸体系分离的可行性,利用Aspen Plus对异丙醇+乙酸异丙酯+水体系进行萃取精馏工艺模拟和优化。结果表明,分离得到乙酸异丙酯质量分数≥98%,异丙醇质量分数≥99%,研究结果不仅补充了部分乙酸+异丙醇酯化反应体系的三元汽液平衡数据,也为体系的共沸物分离提供理论依据。
Vapor-liquid equilibrium data plays an important role in azeotrope separation.To solve the problem of azeotrope separation in acetic acid+isopropanol esterification reaction system,the vapor-liquid equilibrium data of acetic acid+isopropanol+isopropyl acetate,acetic acid+isopropanol+water,acetic acid+isopropyl acetate+water,and isopropanol+isopropyl acetate+water were determined by Dvorak-Boublik equilibrium kettle.Thermodynamic consistency test and NRTL(nonrandom two-liquid)model correlation were performed on the experimental data.The feasibility of azeotrope separation was analyzed by residue curve.The extractive distillation process of isopropanol+isopropyl acetate+water was simulated and optimized by Aspen Plus.The results show that the mass fraction of isopropyl acetate and isopropanol are≥98%and≥99%,respectively.The results provide the data of ternary vapor-liquid equilibrium of acetic acid+isopropanol esterification reaction system,and show a theoretical basis for azeotrope separation of the system.
作者
郭义敏
邹昀
张秀钰
乔颖
童张法
GUO Yimin;ZOU Yun;ZHANG Xiuyu;QIAO Ying;TONG Zhangfa(Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology,School of Chemistry and Chemical Engineering,Guangxi University,Nanning 530004,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2024年第2期172-183,共12页
Journal of Chemical Engineering of Chinese Universities
基金
广西自然科学基金(2017GXNSFDA198047)
广西石化资源加工及过程强化技术重点实验室主任基金(2021Z013)。
关键词
酯化体系
共沸
汽液平衡
残留曲线
萃取精馏
esterification system
azeotrope
vapor-liquid equilibrium
residue curves
extractive distillation
作者简介
郭义敏(1994-),男,安徽定远人,广西大学硕士生;通信联系人:童张法,E-mail:zftong@gxu.edu.cn。
